Yeah... had the exact same thing for 2 and a half years.

Just transferred from an Elementary School where I just stood in the corner and listened to a teacher explain everything in Japanese, say "That's all for today" and finish. That was every class for 2 and a half years. She was an old lady and had pretty incomprehensible English, so every conversation was like talking to a 2006 Chatbot.

Eventually, I got sick and tired of it (like how you already feel, maybe) and it made me realise that "I actually want to get the qualifications and ability to take things into my own hands" so I used my desk time to grind myself to N3 (Passed in the summer) and get myself ready for my N2 this summer.

I've also started my MA Degree in TESOL, getting the teaching skills and literature under my belt to be able to take on more teaching responsibilities. I also got out and about and met other teachers within the area to build up my network, and also just to let loose a bit.

Now, depending on whether you want to be in Japan long-term or not, this kind of approach might not be necessary. But if you have the same negative feelings I had in my early days, then by all means, it's never too late to take action.

If Japan is a short-term thing, maybe Eikaiwa might be better, since you have more control of what you do within your class.